gecko-dev/mfbt/TypedEnumBits.h

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
/* MOZ_MAKE_ENUM_CLASS_BITWISE_OPERATORS allows using a typed enum as bit flags. */
#ifndef mozilla_TypedEnumBits_h
#define mozilla_TypedEnumBits_h
#include "mozilla/IntegerTypeTraits.h"
#include "mozilla/TypedEnumInternal.h"
namespace mozilla {
#define MOZ_CASTABLETYPEDENUMRESULT_BINOP(Op, OtherType, ReturnType) \
template<typename E> \
MOZ_CONSTEXPR ReturnType \
operator Op(const OtherType& e, const CastableTypedEnumResult<E>& r) \
{ \
return ReturnType(e Op OtherType(r)); \
} \
template<typename E> \
MOZ_CONSTEXPR ReturnType \
operator Op(const CastableTypedEnumResult<E>& r, const OtherType& e) \
{ \
return ReturnType(OtherType(r) Op e); \
} \
template<typename E> \
MOZ_CONSTEXPR ReturnType \
operator Op(const CastableTypedEnumResult<E>& r1, \
const CastableTypedEnumResult<E>& r2) \
{ \
return ReturnType(OtherType(r1) Op OtherType(r2)); \
}
MOZ_CASTABLETYPEDENUMRESULT_BINOP(|, E, CastableTypedEnumResult<E>)
MOZ_CASTABLETYPEDENUMRESULT_BINOP(&, E, CastableTypedEnumResult<E>)
MOZ_CASTABLETYPEDENUMRESULT_BINOP(^, E, CastableTypedEnumResult<E>)
MOZ_CASTABLETYPEDENUMRESULT_BINOP(==, E, bool)
MOZ_CASTABLETYPEDENUMRESULT_BINOP(!=, E, bool)
MOZ_CASTABLETYPEDENUMRESULT_BINOP(||, bool, bool)
MOZ_CASTABLETYPEDENUMRESULT_BINOP(&&, bool, bool)
template <typename E>
MOZ_CONSTEXPR CastableTypedEnumResult<E>
operator ~(const CastableTypedEnumResult<E>& r)
{
return CastableTypedEnumResult<E>(~(E(r)));
}
#define MOZ_CASTABLETYPEDENUMRESULT_COMPOUND_ASSIGN_OP(Op) \
template<typename E> \
E& \
operator Op(E& r1, \
const CastableTypedEnumResult<E>& r2) \
{ \
return r1 Op E(r2); \
}
MOZ_CASTABLETYPEDENUMRESULT_COMPOUND_ASSIGN_OP(&=)
MOZ_CASTABLETYPEDENUMRESULT_COMPOUND_ASSIGN_OP(|=)
MOZ_CASTABLETYPEDENUMRESULT_COMPOUND_ASSIGN_OP(^=)
#undef MOZ_CASTABLETYPEDENUMRESULT_COMPOUND_ASSIGN_OP
#undef MOZ_CASTABLETYPEDENUMRESULT_BINOP
#ifndef MOZ_HAVE_CXX11_STRONG_ENUMS
#define MOZ_CASTABLETYPEDENUMRESULT_BINOP_EXTRA_NON_CXX11(Op, ReturnType) \
template<typename E> \
MOZ_CONSTEXPR ReturnType \
operator Op(typename E::Enum e, const CastableTypedEnumResult<E>& r) \
{ \
return ReturnType(e Op E(r)); \
} \
template<typename E> \
MOZ_CONSTEXPR ReturnType \
operator Op(const CastableTypedEnumResult<E>& r, typename E::Enum e) \
{ \
return ReturnType(E(r) Op e); \
}
MOZ_CASTABLETYPEDENUMRESULT_BINOP_EXTRA_NON_CXX11(|, CastableTypedEnumResult<E>)
MOZ_CASTABLETYPEDENUMRESULT_BINOP_EXTRA_NON_CXX11(&, CastableTypedEnumResult<E>)
MOZ_CASTABLETYPEDENUMRESULT_BINOP_EXTRA_NON_CXX11(^, CastableTypedEnumResult<E>)
MOZ_CASTABLETYPEDENUMRESULT_BINOP_EXTRA_NON_CXX11(==, bool)
MOZ_CASTABLETYPEDENUMRESULT_BINOP_EXTRA_NON_CXX11(!=, bool)
#undef MOZ_CASTABLETYPEDENUMRESULT_BINOP_EXTRA_NON_CXX11
#endif // not MOZ_HAVE_CXX11_STRONG_ENUMS
namespace detail {
template<typename E>
struct UnsignedIntegerTypeForEnum
: UnsignedStdintTypeForSize<sizeof(E)>
{};
}
} // namespace mozilla
#define MOZ_MAKE_ENUM_CLASS_BINOP_IMPL(Name, Op) \
inline MOZ_CONSTEXPR mozilla::CastableTypedEnumResult<Name> \
operator Op(Name a, Name b) \
{ \
typedef mozilla::CastableTypedEnumResult<Name> Result; \
typedef mozilla::detail::UnsignedIntegerTypeForEnum<Name>::Type U; \
return Result(Name(U(a) Op U(b))); \
} \
\
inline Name& \
operator Op##=(Name& a, Name b) \
{ \
return a = a Op b; \
}
#define MOZ_MAKE_ENUM_CLASS_OPS_IMPL(Name) \
MOZ_MAKE_ENUM_CLASS_BINOP_IMPL(Name, |) \
MOZ_MAKE_ENUM_CLASS_BINOP_IMPL(Name, &) \
MOZ_MAKE_ENUM_CLASS_BINOP_IMPL(Name, ^) \
inline MOZ_CONSTEXPR mozilla::CastableTypedEnumResult<Name> \
operator~(Name a) \
{ \
typedef mozilla::CastableTypedEnumResult<Name> Result; \
typedef mozilla::detail::UnsignedIntegerTypeForEnum<Name>::Type U; \
return Result(Name(~(U(a)))); \
}
#ifndef MOZ_HAVE_CXX11_STRONG_ENUMS
# define MOZ_MAKE_ENUM_CLASS_BITWISE_BINOP_EXTRA_NON_CXX11(Name, Op) \
inline MOZ_CONSTEXPR mozilla::CastableTypedEnumResult<Name> \
operator Op(Name a, Name::Enum b) \
{ \
return a Op Name(b); \
} \
\
inline MOZ_CONSTEXPR mozilla::CastableTypedEnumResult<Name> \
operator Op(Name::Enum a, Name b) \
{ \
return Name(a) Op b; \
} \
\
inline MOZ_CONSTEXPR mozilla::CastableTypedEnumResult<Name> \
operator Op(Name::Enum a, Name::Enum b) \
{ \
return Name(a) Op Name(b); \
} \
\
inline Name& \
operator Op##=(Name& a, Name::Enum b) \
{ \
return a = a Op Name(b); \
}
# define MOZ_MAKE_ENUM_CLASS_OPS_EXTRA_NON_CXX11(Name) \
MOZ_MAKE_ENUM_CLASS_BITWISE_BINOP_EXTRA_NON_CXX11(Name, |) \
MOZ_MAKE_ENUM_CLASS_BITWISE_BINOP_EXTRA_NON_CXX11(Name, &) \
MOZ_MAKE_ENUM_CLASS_BITWISE_BINOP_EXTRA_NON_CXX11(Name, ^) \
inline MOZ_CONSTEXPR mozilla::CastableTypedEnumResult<Name> \
operator~(Name::Enum a) \
{ \
return ~(Name(a)); \
}
#endif
/**
* MOZ_MAKE_ENUM_CLASS_BITWISE_OPERATORS generates standard bitwise operators
* for the given enum type. Use this to enable using an enum type as bit-field.
*/
#ifdef MOZ_HAVE_CXX11_STRONG_ENUMS
# define MOZ_MAKE_ENUM_CLASS_BITWISE_OPERATORS(Name) \
MOZ_MAKE_ENUM_CLASS_OPS_IMPL(Name)
#else
# define MOZ_MAKE_ENUM_CLASS_BITWISE_OPERATORS(Name) \
MOZ_MAKE_ENUM_CLASS_OPS_IMPL(Name) \
MOZ_MAKE_ENUM_CLASS_OPS_EXTRA_NON_CXX11(Name)
#endif
#endif // mozilla_TypedEnumBits_h